Update WebKitSystemInterface with new method that maps CFNetwork error code to localized description.
        
        Reviewed by Darin Adler.

        * win/include/WebKitSystemInterface/WebKitSystemInterface.h:
        * win/lib/WebKitSystemInterface.lib:
        * win/lib/WebKitSystemInterface_debug.lib:

WebKit/win:
        <rdar://problem/5115298> Don't get error msg when download is interrupted and cannot resume due to server unavailability
        If we fail to get an error description back from CFNetwork, try to get the localized description
        based on the error code.

        Reviewed by Darin Adler.

        * WebError.cpp:
        (WebError::localizedDescription):



git-svn-id: svn://svn.chromium.org/blink/trunk@42767 bbb929c8-8fbe-4397-9dbb-9b2b20218538